ModClothFill it with pork rinds and antacids.Behold the Nacho Wallet ($7.99), a zip clutch that's the spittin' image of a hard-shell taco stuffed with orange cheese and shredded iceberg. It's available online from vintage-inspired Web retailer ModCloth. Next time you hit the Mission for a comida crawl, stock it with Wet Naps, salsa packets, chicharrones, Tums -- totally up to you. And, because we know you're dying to tell us, the reference to nachos is way off base. (Blame the Israeli designer,